Crown sealing device



June 13, 1950 J. wALDMAN CROWN SEALING DEVICE Filed March l0, 1947ATTORNEY Patented June 13, 1950 UNITED. STATES PATENT i OFFICE CROWNSEALING DEVICE Joseph Waldman, Irvington, J. Application March 1o, 1947,serial No. 733,452

1 claim. (c1. 58-90') v The purpose of my invention is to provide anefiicient means for sealing the winding stem 'aperture of a watch caseby means of a valve-like arrangement between the watch case and thewatch crown to thereby eliminate the likelihood of extraneous matterentering the watch case through said aperture.

The accompanying drawing illustrates embodiments of structures employingmy invention described in detail in the ensuing specification. Theseembodiments are merely by way of example and the invention is notlimited thereto but includes all other forms which would come within thescope or purview of the appended claim.

In the drawing:

Fig. 1 is a sectional, segmental view of the outer casing of a watchcase of circular outline, embodying the invention,

Fig. 2 is a vertical, elevational, sectional view of a crown member`used in carrying out my invention,

Fig. 3 is a vertical, elevational view of a spring member,

Fig. 4 is a vertical, sectional view of a coneshaped shell memberadapted to be used in connection with the crown member of Fig. 2,

Fig. 5 is a vertical, sectional view of the parts in position forassembling,

Fig. 6 is a view similar to Fig. 5 but showing the parts assembled, withthe lower edge of the neck portion of the crown member inturned topreclude accidental displacement of the parts,

Fig. 7 is a view similar to Fig. 5, showing the parts assembled on awatch case with the crown threaded on the winding stem of a watch, shownfragmentarily, and

Fig. 8 is a view similar to Fig. 6, showing the application of theinvention to a watch case of non-circular outline.

My invention is designed to provide a valvelike sealing arrangementbetween the watch case and watch crown, whereby the winding stemaperture of the watch case will be effectively sealed. Said aperture inthe conventional watch case is a cylindrical opening deiined by astraight wall. In accordance with the instant invention. the walldefining said opening is provided with a beveled portion somewhat alongthe general lines of a valve seat, and the watch crown is provided witha relatively thin walled annular member of a shape corresponding to afrustrum of a cone, which member is slidably mounted on a dependingportion of the crown and is maintained under tension aeainst the conicalportion of the wall dening said opening to provide a seal, along thelines of a valve sealing arrangement.

As shown in the drawings, the watch crown I0 of my invention is providedwith a circular rim portion Il, having a iiange portion I2 and adepending neck portion I3, said neck portion I3 with the flange I2defining an annular recess I4 for the reception of a spring I5 and aconical shell member l6, which shell member comprises a relatively thinwalled annulus of a shape corresponding to a frustrum of a cone. Theouter casing I1 of the conventional watch case (in Fig. 1 said casing isshown as being of generally circular outline) is provided with a windingstem aperture I8 which is dened by a wall of generally circular outline.In accordance with my invention, the wall defining said aperture I8 isprovided with a beveled portion I9 which, in effect, constitutes a valveseat on which the conical shell member I 6 is urged in the manner of avalve seated on its valve seat. The spring I5 and conical shell memberI5 are assembled in the annular recess I4 of the crown III, and then theouter edge 2U of the flange I2 is inturned to project into the plane ofthe annular recess III, precluding excessive movement or displacement ofthe spring and casing sealing member I6 outwardly of the annular recessI4.

As above stated, the shell member I6 comprises a relatively thin walledannulus which is frustroconical in shape, which member, when assembledin the annular recess I4 of crown I0, has its edge of greatest diameterslidably engaging the outer wall of recess I4 and its edge of smallestdiameter slidably engaging the wall of the depending neck portion, whichshell member is retained within said recess by engagement of its edge ofgreatest diameter with the inturned edge 20 of flange I2.

The assembled parts are shown in Figs. 6 and '7, in which last-mentionediigure the crown I0 is shown secured to the winding stem 2I of thewatch, this being the normal position of the parts when the watch is inuse. In Fig. 8 I have shown the application of the invention to a watchcasing IIa of non-circular outline.

While I have shown in the drawings and have described in the abovespecification, a convenient form of structure embodying my invention, itwill be apparent from such disclosure that the invention is capable ofmany modications without departing from the spirit and scope thereof, asset forth in the appended claim.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

A lcrown for use with a watch case having a winding stem opening definedby a substantially cylindrical wall at least the outermost surface ofwhich is inwardly and downwardly inclined, said crown including an outerdepending flange, and a centrally-positioned depending neck portionadapted to be connected to the winding stem of the watch, the ,outerwallof said: neck portionv and the inner wall of said ange being circum-4ferentially spaced to provide an annular recess therebetween, a shellcomprising a relatively#- shape and which is slidable within saidrecess,

said shell having its edge of greatest=diametenf= uppermost and insliding Contactlwith,i'lheirmer-` wall of said flange and its edgeofvsmallest diameter downward and in sliding contact withthe.

outer wall of said depending neck portion, and

4 said Watch case when said crown is in position on the Winding stem ofthe watch, the lowermost edge of said outer depending flange being bentinwardly after the spring and shell are placed in said recess, tounderlie the edge of the shell of greatest diameter to limit outwardmovement of said spring and shell with respect to said re- CBSS.

JOSEPH WALDMAN.

REFERENCES;CITED'y 'lhe following references are of record in the le' ofthis patent: thin walled annulus which is frustro-xzOIicalr'in :u

UNITED STATES PATENTS Great, Britain sept. 6; 192s4

